Branched propylene-based polymer

A branched propylene-based polymer with controlled multi-branching and strain hardening indices addresses ductility and melt tension issues, improving moldability and stability.

EP4393965B1Active Publication Date: 2025-10-01JAPAN POLYPROPYLENE CORP
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Patent Information

Application Number
EP2022861128
Authority / Receiving Office
EP · EP
Patent Type
Patents
Current Assignee / Owner
Priority Date
2021-08-23
Filing Date
2022-08-08
Publication Date
2025-10-01
Estimated Expiration
2042-08-08

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Abstract

To provide a branched propylene-based polymer that is excellent in ductility when melting, while retaining melt tension necessary for molding. A branched propylene-based polymer having the following properties (1), (2) and (3): property (1): a multi-branching index (MBI) is 0.45 or more and 1.00 or less; property (2): a strain hardening index at a strain rate (dε / dt) of 1.0 / sec (SHI@1s-1) is 0.70 or more and 3.00 or less; and property (3): a maximum drawing rate (MaxDraw) at 230°C and a melt flow rate (MFR) satisfy a relation represented by the following formula (1-1): MaxDraw>112×logMFR+30
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Citation Information

Patent Citations

  • Propylene homopolymer

    JP1998338717A

  • New transition metal compound, catalyst component for alpha-olefin polymerization and production of alpha-olefin polymer

    JP1999240909A

  • Olefin polymerization catalyst and production of olefin polymer

    JP2001064314A

  • Propylene polymer incorporating macromers

    JP2001525460A

  • Branched polypropylene composition

    JP2002523575A